VGA, short for video graphics array, is an interface between a computer and monitor that was widely used before the DVI standard was developed. Introduced by IBM on its PS/2 line in 1987, VGA quickly took the place of the earlier digital CGA and EGA interfaces and enjoyed great popularity among consumers because of its higher resolution and more colors. Generally speaking, VGA systems provide a resolution of 720 by 400 pixels in text mode. Moreover, the resolution is either 640 by 480 (with 16 colors) or 320 by 200 (with 256 colors) in graphics mode. In total, the palette of colors can reach 262,144.
VGA uses analog signals instead of digital signals, which can distinguish it from the earlier graphics standard for PCs, for example, MDA, CGA, and EGA. Older CRTs used VGA, and flat LCD panels typically have both analog VGA and DVI digital. However, as a matter of fact, chances are that some newer PCs are not compatible with VGA interfaces because their monitors are designed for one of the older standards. As a result, VGA is not usable in such systems.
With the rapid development of science and technology, an increasing amount of new and high-tech devices have emerged, which poses some kind of threat to VGA. Those newer devices will provide consumers with greater resolution and more colors. For instance, SVGA, a 8514/A graphics standard, and XGA are mode advanced and easy to utilize. Nonetheless, VGA has always remained the lowest common denominator. Actually, all PCs manufacturers produce today are compatible with VGA. Therefore, you have no need to worry that your computer would fail to work once installed VGA. Although VGA may be not as advanced and versatile as the newly emerged devices, it is still very helpful and powerful.